The US army band marches down Pennsylvania Avenue during a dress rehearsal of the inauguration parade in Washington DC. Photograph: Jim Watson/AFP Photo

Thousands will head to Washington on Monday to witness Barack Obama being sworn in for another four years as US president. The world will be watching with plenty to say, and we want to hear your advice, warnings and messages of support – and criticism – for the president.

In 2008, Guardian readers sent more than 800 photos displaying their messages to Obama using our Message to Obama Flickr pool. We've re-opened the group to accept new submissions and grow the existing community.

But you can also add a photo to our project by using a photo sharing service of your choice – Instagram, Flickr or Twitter – tagging the photos with #Message4Obama.

A few things to remember: Turn on geolocation services (photo maps and so on), and if you're using Flickr, remember to make sure your photo is saved under creative commons licensing. Making sure those settings are switched on will allow us to find and display your photo on a board powered by n0tice.com in the coming days.

We'll let you know when the gallery is published.

Tell us with text

No phone? No Flickr? No problem. Just fill out the form below and we'll turn your words into an image like this, and it will appear in the final gallery.